#!/usr/bin/env python
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import os
import stat
import sys

from ansible import constants as C
from ansible.errors import AnsibleError
from ansible.executor.playbook_executor import PlaybookExecutor
from ansible.inventory import Inventory
from ansible.parsing import DataLoader
from ansible.parsing.splitter import parse_kv
from ansible.playbook import Playbook
from ansible.playbook.task import Task
from ansible.utils.cli import base_parser, validate_conflicts, normalize_become_options, ask_passwords
from ansible.utils.unicode import to_unicode
from ansible.utils.vars import combine_vars
from ansible.utils.vault import read_vault_file
from ansible.vars import VariableManager

# Implement an ansible.utils.warning() function later
def warning(*args, **kwargs):
    print(*args, **kwargs)

#---------------------------------------------------------------------------------------------------

def main(args):
    ''' run ansible-playbook operations '''

    # create parser for CLI options
    parser = base_parser(
        usage = "%prog playbook.yml",
        connect_opts=True,
        meta_opts=True,
        runas_opts=True,
        subset_opts=True,
        check_opts=True,
        diff_opts=True,
    )

    # ansible playbook specific opts
    parser.add_option('--list-tasks', dest='listtasks', action='store_true',
        help="list all tasks that would be executed")
    parser.add_option('--step', dest='step', action='store_true',
        help="one-step-at-a-time: confirm each task before running")
    parser.add_option('--start-at-task', dest='start_at',
        help="start the playbook at the task matching this name")
    parser.add_option('--list-tags', dest='listtags', action='store_true',
        help="list all available tags")

    options, args = parser.parse_args(args)

    if len(args) == 0:
        parser.print_help(file=sys.stderr)
        return 1

    validate_conflicts(parser,options)

    # Note: slightly wrong, this is written so that implicit localhost
    # Manage passwords
    sshpass    = None
    becomepass    = None
    vault_pass = None

    # don't deal with privilege escalation when we don't need to
    if not options.listhosts and not options.listtasks and not options.listtags:
        normalize_become_options(options)
        (sshpass, becomepass, vault_pass) = ask_passwords(options)

    if options.vault_password_file:
        # read vault_pass from a file
        vault_pass = read_vault_file(options.vault_password_file)

    loader = DataLoader(vault_password=vault_pass)

    extra_vars = {}
    for extra_vars_opt in options.extra_vars:
        extra_vars_opt = to_unicode(extra_vars_opt, errors='strict')
        if extra_vars_opt.startswith(u"@"):
            # Argument is a YAML file (JSON is a subset of YAML)
            data = loader.load_from_file(extra_vars_opt[1:])
        elif extra_vars_opt and extra_vars_opt[0] in u'[{':
            # Arguments as YAML
            data = loader.load(extra_vars_opt)
        else:
            # Arguments as Key-value
            data = parse_kv(extra_vars_opt)
        extra_vars = combine_vars(extra_vars, data)

    # FIXME: this should be moved inside the playbook executor code
    only_tags = options.tags.split(",")
    skip_tags = options.skip_tags
    if options.skip_tags is not None:
        skip_tags = options.skip_tags.split(",")

    # initial error check, to make sure all specified playbooks are accessible
    # before we start running anything through the playbook executor
    for playbook in args:
        if not os.path.exists(playbook):
            raise AnsibleError("the playbook: %s could not be found" % playbook)
        if not (os.path.isfile(playbook) or stat.S_ISFIFO(os.stat(playbook).st_mode)):
            raise AnsibleError("the playbook: %s does not appear to be a file" % playbook)

    # create the variable manager, which will be shared throughout
    # the code, ensuring a consistent view of global variables
    variable_manager = VariableManager()
    variable_manager.set_extra_vars(extra_vars)

    # create the inventory, and filter it based on the subset specified (if any)
    inventory = Inventory(loader=loader, variable_manager=variable_manager, host_list=options.inventory)
    variable_manager.set_inventory(inventory)

    # (which is not returned in list_hosts()) is taken into account for
    # warning if inventory is empty.  But it can't be taken into account for
    # checking if limit doesn't match any hosts.  Instead we don't worry about
    # limit if only implicit localhost was in inventory to start with.
    #
    # Fix this when we rewrite inventory by making localhost a real host (and thus show up in list_hosts())
    no_hosts = False
    if len(inventory.list_hosts()) == 0:
        # Empty inventory
        warning("provided hosts list is empty, only localhost is available")
        no_hosts = True
    inventory.subset(options.subset)
    if len(inventory.list_hosts()) == 0 and no_hosts is False:
        # Invalid limit
        raise errors.AnsibleError("Specified --limit does not match any hosts")

    # create the playbook executor, which manages running the plays
    # via a task queue manager
    pbex = PlaybookExecutor(playbooks=args, inventory=inventory, variable_manager=variable_manager, loader=loader, options=options)

    if options.listhosts:
        print('TODO: implement')
        sys.exit(0)
    elif options.listtasks:
        print('TODO: implement')
        sys.exit(0)
    elif options.listtags:
        print('TODO: implement')
        sys.exit(0)
    else:
        return pbex.run()

if __name__ == "__main__":
    #display(" ", log_only=True)
    #display(" ".join(sys.argv), log_only=True)
    #display(" ", log_only=True)
    try:
        sys.exit(main(sys.argv[1:]))
    except AnsibleError as e:
        #display("ERROR: %s" % e, color='red', stderr=True)
        print(e)
        sys.exit(1)
    except KeyboardInterrupt:
        #display("ERROR: interrupted", color='red', stderr=True)
        print("keyboard interrupt")
        sys.exit(1)